JPH0771728A - Burner - Google Patents

Abstract

PURPOSE:To facilitate ignition to waste plastics, so as to enable a stable combustion by arranging nozzles for spraying liquid on the outer periphery of a nozzle for injecting powder. CONSTITUTION:A gas burner is ignited by a spark of high-pressure electricity, and then fuel oil burners 4 are successively ignited by the gas burner. Next, solid waste plastics crushed into the grain diameter of 1mm or less are injected from a powder injection nozzle 10 by air for conveyance and then ignited by the fuel oil burners 4, and the combustion air amount from combustion air pipes 11 is adjusted, thereby the waste plastics are completely burnt. A thin plastic waste which is some millimeters square, other than powder-like one, for example, a plastic waste obtained by crushing a PET bottle or that obtained by crushing a plastic film can be used as the waste plastics. Thereby ignition to the waste plastics can be easily performed, and a stable combustion can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for burning waste plastic.

[0002]

2. Description of the Related Art A conventional burner for burning powder such as pulverized coal mainly has an oil burner for burning oil in the center for igniting the powder and a powder burner for burning powder on the outer periphery thereof. is doing.

FIG. 5 is an explanatory view showing the structure of a conventional burner.

More specifically, as shown in the figure, there is one heavy oil burner 4 at the center, and the powder jet nozzle 1 for carrying pulverized coal by air to the outside thereof and jetting it into the furnace.
0 is arranged, and a combustion air pipe 11 for supplying combustion air to the furnace is further arranged on the outer periphery thereof.

[0005]

When the powder is pulverized coal, the oil burner is first ignited, and when the pulverized coal is ejected, the volatile substance is generated from the pulverized coal due to the heat of the oil burner. Then, the carbon component of the pulverized coal is ignited and combustion continues. However, since waste plastic does not easily generate volatile substances like pulverized coal, a waste plastic burner with a conventional oil burner arranged at the center,
The process of slow ignition due to insufficient heat input from the oil burner, igniting volatile substances and then igniting waste plastic particles and continuing combustion cannot be expected, and ignition is difficult and combustion is unstable. become.

Further, in a boiler in which the furnace wall is composed of a water pipe, it is not expected that the waste plastic is thermally decomposed by the radiation from the furnace wall to generate a volatile substance.

An object of the present invention is to provide a burner in which waste plastic can be easily ignited and stable combustion can be performed.

[0008]

In the burner provided with a nozzle for ejecting powder and a nozzle for ejecting liquid, a nozzle for ejecting the liquid is arranged on the outer periphery of the nozzle for ejecting the powder. It is achieved by doing.

The particle diameter of the nozzle for ejecting the powder is 1 mm.
It is desirable that the nozzle is one that ejects the following solid plastics.

[0010]

According to the above construction, the radiant heat to the powder is increased, so that the ignition is facilitated and the combustion is stabilized even when the radiation from the furnace wall is small.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the structure of this embodiment will be described.

FIG. 1 is a vertical sectional view showing the structure of a burner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

As shown in FIGS. 1 and 2, a powder jet nozzle 10 for jetting a powdered waste plastic is arranged at the center, and a heavy oil burner 4 having six heavy oil jets for spraying heavy oil is provided on the outer periphery thereof. And an annular combustion air pipe 11 for supplying combustion air to the furnace.

Next, the operation of this embodiment will be described.

In order to burn the waste plastic, a gas burner (not shown) is ignited by a high-voltage electric spark, then the heavy oil burner 4 is sequentially ignited by the gas burner, and then the powder ejection nozzle 10 is blasted by air for transportation. Solid waste plastic crushed from 10 to 1 mm or less is ejected and ignited by the heavy oil burner 4, and the combustion air pipe 1
The amount of combustion air from 1 is adjusted to completely burn the waste plastic.

The waste plastic may be in the form of flakes having a size of several mm square other than particles, for example, a crushed PET bottle or crushed plastic film.

FIG. 3 is a vertical sectional view showing the structure of a burner according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of FIG.

The examples shown in FIGS. 3 and 4 are composed of four heavy oil burners 4, and are effective when the radiation from the furnace wall is small or when the amount of waste plastic burned is large.

[0022]

According to the present invention, waste plastic can be easily ignited and stable combustion can be achieved when the radiation from the furnace wall is small.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the structure of a burner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a cross-sectional view showing the structure of a burner according to another embodiment of the present invention.

4 is a cross-sectional view of FIG.

FIG. 5 is a vertical sectional view showing the structure of a conventional burner.

[Explanation of symbols] 4 heavy oil burner 10 powder ejection nozzle 11 combustion air tube

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Nonaka 3-1-1 Tama, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works

Claims (2)

[Claims] 1. A burner provided with a nozzle for ejecting powder and a nozzle for ejecting liquid, wherein the nozzle for ejecting the liquid is arranged on the outer circumference of the nozzle for ejecting the powder. 2. The particle diameter of the nozzle for ejecting the powder is 1 m.
The burner according to claim 1, wherein the burner is a nozzle for ejecting solid plastic of m or less.